ZIP code 54423 is officially located in the state of Wisconsin, primarily serving the city of Custer. It falls under the administrative jurisdiction of Portage County. When planning mail delivery, logistics routing, or demographic research, 54423 operates within the Central Time (CT) timezone and supports the 449 area codes.
According to the latest US Census Bureau and American Community Survey (ACS) datasets, the total population residing within the 54423 ZIP Code Tabulation Area is approximately 15,849. Understanding local economics is critical for market analysis; the median household income in this postal area sits at $131,423.